Control And Functions - ComfortStar CVH-18-2SH Service Manual

value
HeatStopI Heating stop protection current
value
5.3.7 Indoor / Outdoor Units Communication
Protection
If the indoor units do not receive the feedback
signal from the outdoor units for 2 consecutive
minutes, the unit stops. The unit displays the
failure code.
5.3.8 High Condenser Coil Temp. Protection
T3
Off
Decrease
Hold
Resume
5.3.9 Outdoor Unit Anti-Freezing Protection
When T2<4℃ for 250seconds or T2<0℃, the
indoor unit capacity demand is zero and resumes
normal operation when T2>8℃ and the protection
time is no less than 3 minutes.
5.3.10 Oil Return
Rules for Operation
1. If the compressor frequency continues to be
lower than the frequency set for setting time, the
unit raises the frequency to the frequency set for
setting time and then resumes with the former
frequency.
2. The EXV continues at 300p while indoor units
maintain their operation.
If the outdoor ambient temperature is higher than
the set frequency during oil return, the unit stops
the oil return process.
5.3.11 Low Outdoor Ambient Temperature
Protection
When the compressor is off and T4 is lower than -
35℃ for 10 seconds, the unit stops and displays
"LP" or "PC0L"
When the compressor is on and T4 remains lower
than -40℃ for 10 seconds, the unit stops and
displays "LP" or "PC0L"
When T4 is no lower than -32℃ for 10 seconds,
the unit exits protection.

5.4 Control and Functions

5.4.1 Capacity Request Calculation
For Old Console series, Old Duct/Cassette/Floor
Ceiling, Old Vertu/Luna Series:
Total capacity Request=Σ(Norm code × HP) /10×
modify rate+ correction
For All new models(New Wall mounted(Hi-Wall)
series, New Duct/Cassette/Console/Floor Ceiling):
Total capacity Request=Σ(Norm code × HP) /40×
modify rate+ correction ∑
Cooling Mode:
T1 Ts
a
3
b
c
2
1 d
0
e
1
f
Capacity area
Norm code (N)
Model 9K
HP 1.0
Note: The final result is an integer.
Use the following table and final capacity
request to confirm the operating frequency.
19
4
3
2
1
0
a b c d e
3 2 1.5 1 0.5
12K 18K 24K
1.2 1.5 2.5
f
0